LN-9 wire feeders are grounded to the power source
through the input cable. The power source grounding
cable must be properly connected to electrical ground.
See your power source operating manual for details.

WORK CABLE CONNECTION

Connect a work lead of sufficient size and length
between the proper output terminal on the power
source and the work. See Table A-1. Be sure the con-
nection to the work makes tight metal-to-metal electri-
cal contact. Poor work lead connections can activate
the grounding lead protector and/or result in poor weld-
ing performance.

TABLE A.1 – WORK CABLE SIZES

Current

Copper Work Cable Size, AWG

60% Duty Cycle Up to 50' length 50'-100' Iength

300 Amps

000

400 Amps

0000

500 Amps

000

0000

600 Amps

000

Two 000

DIRECT WORK LEAD CONNECTION

Lincoln specified procedures give voltage readings
taken between the work and the gun cable brass con-
nection block of the LN-9. To match these voltage read-
ings, the connection diagrams show the #21 lead being
extended and connected directly to the work instead of
#21 on the power source terminal strip (or Dual
Process Kit terminal strip). This extended lead must be
connected directly to the work. When using a Dual
Process Kit, you must extend the lead individually for
each LN-9.

As an alternative, LN-9 models are provided with a
quick-connect terminal splice connection in the #21
lead between the input Amphenol connector of the
LN-9 and its polarity switch. See the LN-9 wiring dia-
gram. This in-line connection consists of a red insulat-
ed male and female .250 x .032 terminal pair located in
the lead harness. It runs along the right side of the wire
feed motor inside the control section of the LN-9N and
S models and in the lead harness at the lower left cor-
ner of the control box (near the input Amphenol) of the
LN-9F models. You may also open this #21 lead and
connect your own direct work lead equipped with a
.250 x .032 female quick-connect terminal to the male
side of the splice. This direct work lead connection
must be tape insulated, strain-relieved, and routed out-
side the LN-9 control box to be connected directly to
the work.

With either direct work lead connection method, the
LN-9 regulates the power source to hold the arc volt-
age constant, even with voltage drops in the electrode
lead, work lead, or work lead connection. If the direct
work lead becomes disconnected from the work, the
LN-9 wire feeder will stop welding shortly after the arc
is struck. See the topic "

Circuit Protection and

Automatic Shutdown" in the Operation section of
this manual.

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